However, she has since discussed the film with Tarantino and his team, and given it her full support.

A second movie about Tate's murder - titled The Haunting of Sharon Tate and starring Hilary Duff - has also been labelled "tasteless" by Tate's sister.

Image:Cult leader Charles Manson photographed in 1989

Both films have been timed to arrive in cinemas for the 50th anniversary of the murders.

Manson's followers - made up mainly of young women - committed a series of nine murders at four locations across California in July and August 1969.

Image:Brad Pitt and Leonardo DiCaprio play a TV actor and his stunt double in the film

Once Upon A Time In Hollywood tells the story of a TV actor and his stunt double - played by Brad Pitt and Leonardo DiCaprio - who are determined to make their mark on the Los Angeles film scene at the time of the killings.